Skull Width Reduction, Both Muscle and Bone?

i have severe positional plagiocephaly. My skull appears to be really flat, and the right side of my skull is flatter than the left .This deformity my face looks very wide and asymmetrical, the right side of my face is about 0.7 cm wider than the left. A surgeon in Texas proposed a surgery to reduce the width of my skull by both thinning the temporalis muscle as well as burring the skull bone directly above ear. What are the risks of this surgery and will the burred bone grow back. Thanks!